Of same place



2 Sheets-Sheet 1.

Patented Aug. 15, 1893.

,(No Model.)

F. E. KEYES. MACHINE FOR FORMING HOLLOW PULP ARTICLES. No. 508,284.

A F a w a K W w B a V m X I m 1d n & A M f e a B A d m C F w k $11M af (No Model.)

2 Sheets-Sheet 2.

LP ARTIGLES. Patented Aug. 15, 1893.

- F. E. KEYBS. MACHINE FOR FORMING HOLLOW PU No. 503,284.,

UNITED STATES PATENT OFFICE.

FRANK E. KEYES, OF LOCKPORT, NEW YORK, ASSIGNOR TO THE UNITED INDURATED FIBRE COMPANY OF NEV JERSEY, OF SAME PLACE.

MACHINE FOR FORMING HOLLOW PULP ARTICLES.

SPECIFICATION forming part of Letters Patent No. 503,284, dated August 15, 1893.

Application filcdApril 20, 1893. SerialNoA7L078. (No model.)

To aZZ whom it may concern.-

Beitknown thatl, FRANK E. KEYES, a citizen of the United States, residing at Lockport, in the county of Niagara and State of New York, have invented certain new and useful Improvements in Machines for Forming Hollow Pulp Articles; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Myinvention relates to machines for forming pails and other like hollow articles from pulp and it relates particularly to that class of machines wherein a rubber bag or diaphragm is employed for applying hydrostatic pressure to the wet pulp as it is formed. These machines are composed of a dome or case, having the lower end open and in this open end fits a movable base to which is secured the pervious male die or former. hen in place the former is within the dome, a space or chamber being left between the two. Within this space and surrounding the former is the rubber diaphragm secured at the bot tom to thelower end of the dome and at the upper end to a head or chine plate which molds the bottom of the pail. The liquid pulp is admitted under pressure between the former and the diaphragm and as the Water percolates through the former the pulp is deposited on its surface, the bag being expanded out against the dome and the head raised to its upper end. ater under a heavy pressure is then admitted outside of the diaphragm, forcing it against the pulp on the former and compressing and molding it into the desired shape, the head being at the same time forced down to mold the bottom of the pail. On the lower side of the head is an annular groove with a pervious lining and this groove forms the chine of the pail, the water which is squeezed from the chine asit is compressed being conveyed by ducts into a space or chamberin the interior of the head, whence it is conveyed out through a spindle connecting with the head. This head has hitherto been made of two plates secured together, with a space or chamber between them, the upper edge of the cylindrical or frustumshaped rubber diaphragm being clamped between the plates. The annular space within which this edge was confined thus communicated directly with the chamber formed between the two plates in the middle of the head. As a consequence of this construction the water from outside the diaphragm would force its way when the pressure was on, through the joint between the plates, into the chamber and thence back through the ducts and drainage surface into the chine of the pail saturating and softening it while the rest of the pailwas drying out. The consequence of this would be thatthe portion of the diaphragm immediately below the head would compress the soft pulp at this point more than the balance of the side was compressed forming in the pail an annular depression or groove near its bottom which interfered with the finish and quality of the pail. I remedy this difficulty in my present invention by securing the upper edge of the diaphragm to the top of the upper plate so that it will not be connected with the drainage space spoken of and the pressure of water will not be able to force its way inside of the diaphragm. It may also be easily removed without taking the plates apart.

Another feature of my invention relates to securing the lower edge of the diaphragm in such a manner that it may be readily removed when required, for repairs, drc, being at the same time firmly held when the machine is in operation. It is very important to so secure the bag that it may be readily removed, because it is often necessary to take it out for the purpose of mending holes which form in it and the more quickly this can be done the more use can be had of the machine. According to my invention I form around the inside of the dome at its lower end a two sided recess into which the lower edge of the bag tits and I secure it within said recess by means of a ring having an'outward extending flange, the flange confining the lower end of the diaphragm while the ring proper supports its inher surface. The ring is removably secured by suitable means such as the screws hereinafter described. The ring and the lower edge of the bag constitute a packing between the base and the dome.

I illustrate my invention by means of the accompanying drawings in which- Figure 1 represents a vertical section through a pail machine, embodying my invention and Fig. 2 is a section on w as of Fig. 1.

A represents the dome of the machine, A

the dome base or ring bolted to the bottom and forming the lower end of the dome, B the pervious former, E the movable base to which it is secured, and h is the piston rod to the upper end of which the base is secured.

The parts of the machine so far described are old and well-known and need no further description. Around the inside of the dome, as here shown at the top of the ring A, I form a two-sided recess or groove opening downward. WVithin this recess fits the lower edge of the diaphragm 0, this edge having an annular projection c for the purpose of fitting the recess. The diaphragm is secured in the recess by means of a ring F having an outside flangef. The ring proper rests against the inside of the diaphragm and the flange supports the lower edge. The ring is secured in position as herein shown by means of screws which are screwed upward into the ring A immediately outside of the ring F in such a manner that the outer edge ofthe fiangef will rest on theinner edges of the screw heads. One side of each screw head is cut away so that when it is unscrewed and turned to a certain position the ring will be released and allowed to drop out. It will be observed'that when the ring is removed there is nothing to keep the lower edge of the bag in place and it immediately drops out.

The chine plate or head ismade as usual of two plates an upper plate D and an under plate D with adrainage space cl between them which connects with the ductjin the spindle J. 61 is the annular groove around the under side of the head havingadrainage surface connected by ducts d with the drainage space d. The upper edge of the diaphragm is secured to the top of the plate D and preferably in a recess (1' formed for the purpose. An annular plate a is provided to secure the edge of the diaphragm in the recess and it is secured to the plate by means of screws e. It will thus be seen that the joint made between the plate and the diaphragm has no connection with the drainage spaceand before the water could force itself into the chine of the pail it would have to go through to the back edge of the diaphragm and back underneath it. The pressure on the shoulder of the plate where it turns over will always cause a tight joint so that with a head thus constructed it is impossible for the water to find its Way within the diaphragm. As a result of this improved construction all the pails now made on the machine instead of having grooves near the bottom are square and true up to the corner of the chine and the chine itself is harder and stronger.

The bag can be quickly removed from the machine by the removal of the ring F and the plate 6 without disturbing the other parts. The effioiency of the machine is thus increased and the quality of the work improved.

I claim 1. In a machine for forming pails or other articles of pulp, an elastic diaphragm, ahead for securing the upper edge of the same, composed of an upper and an under plate secured together face to face with a space or chamber between them, said head having on its under side a drainage surface connected by duets with the space between said plates, the upper edge of the diaphragm extending up over said upper plate and a plate for securing it in place, in combination substantially as described.

2. In a machine for forming pails or other like articles of pulp, an elastic diaphragm, a head for securing the upper edge of the same, composed of an upper and an under plate secured together face to face witha space or chamber between them, said head having on its under side a drainage surface connected by duets with the space between said plates, the top of the upper plate being provided with a recess atits outer edge within which recess the upper edge of the diaphragm fits and a plate for securing it in place, in combination substantially as described.

3. In a pulp molding machine the combination of an open ended dome or case, a male die or former fitting within said dome or case, a movable base to which said former is se cured fittingthe open end or base of said dome, an annular two-sided recess extending around the inner surface of said dome adjacent to its open end, an elastic diaphragm between said former and said dome the lower end of said diaphragm fitting said recess, a flanged ring for holding said diaphragm in said recess and means for removably securing said ring to said dome, substantially as described.

4. In a pulp molding machine the combination of an open-ended dome or case, a male die or former fitting within said dome or case, a movable base to which said former is secured fitting the open end or base of said dome, an annular two-sided recess extending around the inner surface of said dome adjacent to its open end, an elastic diaphragm between said former and said dome FRANK E. KEYES.

Witnesses:

T. M. MOGRATH, E. E. FOLGER. 

